Gas detection device of expiration detector

Abstract

The invention relates to the technical field of infrared spectrometer detection and discloses an expiration detector gas detection device. The device comprises a gas chamber, a detection part and a control circuit, wherein the air chamber comprises more than one air chamber pipe, medium pipes corresponding to the air chamber pipes, a first connecting piece and a second connecting piece, the detection part comprises a light source and a detector which are respectively arranged on two sides of the air chamber and form a light path, the control circuit comprises a main board and a preamplifier board which are electrically connected with each other, the main board provides a pulse type constant current source, and the pulse type constant current source is used for supplying power to the light source in the light path; the front amplifier board is used for amplifying, filtering and rectifying the electric signal to form a light intensity voltage signal. According to the device, a liquid medium sleeve structure is additionally arranged on the periphery of a current gas chamber structure, so the temperature of gas in the gas chamber changes slowly, uniformly and stably, the influence on a test result is reduced, and meanwhile, a more reliable pulse circuit is adopted to control light waves, the power-on working time of the light source is shortened, the service life is longer, and flexibility is relatively high.

Description

technical field [0001] The invention relates to the technical field of infrared spectrometer detection, in particular to a gas detection device for a breath detector. Background technique [0002] The breath test is a non-invasive method for in vitro detection of labeled compounds after they are introduced into the body for metabolism. Stable isotope ratio analysis can be used in medicine to diagnose diseases. When the subject takes isotope-containing drugs, the metabolic function of the organism can be determined by measuring the isotope concentration or concentration ratio changes in the breath. At present, the infrared spectrum detection device equipped with a two-chamber detection unit is commonly used to detect the carbon dioxide isotope 13 C and 12 C is used for test analysis. Infrared spectroscopy detection technology requires high detection accuracy and is easily inaccurate due to interference from external temperature and current stability. Therefore, it is necess...

AI Technical Summary

Problems solved by technology

At present, the infrared spectrum detection device equipped with a two-chamber detection unit is commonly used to detect the carbon dioxide isotope 13 C and 12 C for test analysis. Infrared spectrum detection technology has high requirements for detection accuracy, and it is easy to be inaccurate due to interference from external temperature and current stability. Therefore, it is necessary to further improve the stability of the detection process.

Images